Float glass for display substrate and method for producing it

a technology of substrate glass and floating glass, which is applied in the direction of glass rolling apparatus, glass making apparatus, manufacturing tools, etc., can solve the problems of unstable production, affecting the life span of production apparatuses, and asymmetrical substrate glass at anterior and posterior, so as to reduce the temperature of each step carried out for producing substrate glass, the effect of stable production and low viscosity
US7892999B2Inactive Publication Date: 2011-02-22ASAHI GLASS CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
ASAHI GLASS CO LTD
Publication Date
2011-02-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

A float glass for a display substrate, characterized in that its composition consists essentially of, as represented by mass % based on oxide, from 52 to 62% of SiO2, from 5 to 15% of Al2O3, from more than 0% to 9% of MgO, from 3 to 12% of CaO, from 9 to 18% of SrO, from 0 to 13% of BaO, from 25 to 30% of MgO+CaO+SrO+BaO, from 6 to 14% of Na2O+K2O+Li2O, from 0 to 6% of ZrO2 and from 0 to 1% of SO3, the temperature of glass melt corresponding to the viscosity of 102 dPa·s is at most 1,520° C., the temperature of glass melt corresponding to the viscosity of 104 dPa·s is at most 1,120° C., the glass transition temperature is at least 610° C., and the specific gravity is at most 2.9.
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Description

TECHNICAL FIELDThe present invention relates to a glass for a display substrate, particularly a float glass which is preferred as a glass for a plasma display panel (hereinafter referred to as PDP) substrate and a method for producing the float glass.BACKGROUND ARTHeretofore, PDP is generally produced by firing metal electrodes, an insulating paste, a rib paste, etc. on a substrate glass at a temperature of from about 550 to 600° C., followed by frit sealing opposed plates and its vicinity. Heretofore, in general soda lime silica glass which is widely used for buildings and automobiles has been used as a glass for a PDP substrate.However, since the glass transition temperature of the soda lime silica glass is from 530 to 560° C., if the glass is heat-treated at the above firing temperature, the substrate glass deforms or shrinks, and the dimension remarkably changes. Therefore, it has been desired to realize positioning opposed plates and electrodes accurately. Particularly, in a ca...

Claims

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